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Solvent free bi-component polyurethane adhesive and preparation method thereof

A two-component polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of opaque adhesives, inability to achieve low viscosity, high peel strength solvent-free polyurethane adhesives, etc. Achieve good peel strength, good environmental protection effect, good low temperature coating effect

Inactive Publication Date: 2009-12-09
NANTONG GAOMENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the appearance of the prepared adhesive is opaque
[0007] The inventors have found that the above-mentioned prior art has at least the following problems: Although a large amount of research work has been done on solvent-free polyurethane adhesives in the above materials, the transparency, low viscosity, low-temperature coating properties, high peel strength and retort resistance of the system etc., can not meet the requirements of preparing low viscosity, high peel strength solvent-free polyurethane adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This implementation provides a solvent-free two-component polyurethane adhesive, which includes: component A and component B, wherein component A is an isocyanate-terminated compound, and component B is a polyhydroxy compound;

[0042] The component A is formed by reacting polyisocyanates and polyhydroxyl compounds, and the polyhydroxyl compounds are composed of polyether polyols, polyester polyols, and small molecule polyols; the isocyanate group weight content (NCO %) in the range of 5% to 12%, preferably 8% to 10%, viscosity at 25°C in the range of 1000 to 20000mPa.s, preferably 2000 to 5000mPa.s, based on the total weight of the polyol in component A Calculated as 100%, the proportion of polyether polyol is 5% to 90%, the proportion of polyester polyol is 5% to 90%, and the proportion of small molecular polyol is 0.5% to 10%.

[0043] Mix the polyhydroxy compound at 30-50°C, add polyisocyanate, react at 60-80°C for 3-4 hours, and cool down to normal temperature to p...

Embodiment 2

[0065] This embodiment provides a method for preparing a solvent-free two-component polyurethane adhesive, specifically as follows:

[0066] Raw materials and proportions of polyester polyols:

[0067] Isophthalic acid / adipic acid / ethylene glycol / 1,2-propanediol=1 / 2 / 3 / 0.6 (molar ratio);

[0068] Raw materials and proportions of component A:

[0069] Polyester polyol 100g, polypropylene glycol ether (2000 molecular weight) 500g, 1,4-butanediol 5g, MDI 350g, IPDI 30g;

[0070] Properties: transparent liquid, viscosity 4000mPa.s at 25°C.

[0071] Raw materials, ratio and process of component B:

[0072] Polyester polyol 720g, polypropylene glycol ether (1000 molecular weight) 250g, castor oil 10g, rosin resin 10g;

[0073] Mix polypropylene glycol ether, polyester polyol and castor oil at 40°C, add rosin resin, heat to 90-100°C, keep warm and stir for 2 hours, until the rosin resin is completely dissolved and the whole component B is clear and transparent, then cool down.

...

Embodiment 3

[0077] This embodiment provides a method for preparing a solvent-free two-component polyurethane adhesive, specifically as follows:

[0078] Raw materials and proportions of polyester polyols:

[0079] Isophthalic acid / adipic acid / ethylene glycol / 1,2-propanediol=1 / 2 / 3 / 0.6 (molar ratio).

[0080] Raw materials and proportions of component A:

[0081] Polyester polyol 100g, polypropylene glycol ether (2000 molecular weight) 500g, 1.4-butanediol 6g, blended MDI 350g, IPDI 30g;

[0082] Properties: transparent liquid, viscosity 3500mPa.s at 25°C.

[0083] Raw materials, ratio and process of component B:

[0084] Polyester polyol 720g, polypropylene glycol ether (1000 molecular weight) 250g, castor oil 10g, epoxy resin 10g, rosin resin 10g;

[0085] Mix polypropylene glycol ether, polyester polyol, castor oil and epoxy resin at 40°C, add rosin resin, heat to 90-100°C, keep stirring for 2 hours, until the rosin resin is completely dissolved, and the whole component B is clear an...

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Abstract

The invention discloses solvent free bi-component polyurethane adhesive and a preparation method thereof, wherein the solvent free bi-component polyurethane adhesive relates to a compound soft package adhesive in the fields of food, medicine, and the like. The adhesive comprises a component A and a component B, wherein the component A is an isocyanate compound, the component B is polyol, and the adhesive is obtained in such a way that the component A and the component B are mixed according to the weight percent of 2:1. The adhesive solves the problem that the use effect is influenced and the use range is limited because of poor properties of transparency, viscosity, low-temperature coating and stripping strength, and boiling resistance existing in the prior solvent free adhesive. The adhesive is environmental-friendly without solvent because the component A and the component B of the adhesive both are transparent liquid, has low viscosity as well as better low-temperature coating and stripping strength, and keeps better stripping strength after being boiled, thereby being environmental-friendly adhesive, wherein the viscosity of the component A is 2000-5000MPa.s and the viscosity of the component b is 400-2000MPa.s below 25 DEG C.

Description

technical field [0001] The invention relates to a polyurethane adhesive, in particular to an environmentally friendly solvent-free two-component polyurethane adhesive that can be used as an interlayer adhesive for composite flexible packaging in the fields of food and medicine. Background technique [0002] Solvent-based polyurethane adhesives are widely used in the composite flexible packaging industry. However, organic solvents are flammable, explosive, volatile, and smelly, causing air pollution when used, and are more or less toxic; With more and more emphasis on safety performance and increasing public opinion pressure to protect the earth's environment, green and environmentally friendly solvent-free composite adhesives have attracted more and more attention as one of the substitutes for solvent-based composite adhesives. [0003] However, because the solvent-free adhesive does not contain a solvent, its viscosity is very high, and the spreadability of the glue during ...

Claims

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Application Information

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IPC IPC(8): C09J175/04
Inventor 田立云沈峰刘稳娣
Owner NANTONG GAOMENG NEW MATERIAL
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